A car running at 60 kph has a braking distance of 30 m. If the coefficient of resistance between the tire and pavement is 0.5, find the grade if said car travel was uphill.

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A car running at 60 kph has a braking distance of 30 m. If the coefficient of resistance between the tire and pavement is 0.5, find the grade if said car travel was uphill. 
a. 2.79%
b. 1.17%
c. 2.36%
d. 2.14%
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